Which of the following statements are true? Give reasons for your answers. 
 a) Usually the first experience of subtraction that a child has is in Class I.
 b) Primary school children of any age continue to feel the need to use concrete aids for
learning.
 c) Learning algebra helps the child to develop mathematical thinking.
 d) Children don’t get an opportunity to apply their knowledge of negative numbers till
they reach class 10.
 e) The language of mathematics is made up of the terminology and symbols used in
mathematics. 

Based on the information provided, let's evaluate each statement:

a) Usually the first experience of subtraction that a child has is in Class I.
False. Generally, subtraction is introduced to children in the early years of primary school, often in kindergarten or Class I (around 5-6 years of age). It is one of the fundamental arithmetic operations taught at an early stage of mathematics education.

b) Primary school children of any age continue to feel the need to use concrete aids for learning.
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